diff --git a/mingw-w64-headers/crt/intrin.h b/mingw-w64-headers/crt/intrin.h
index 54ef713..21aeb91 100644
--- a/mingw-w64-headers/crt/intrin.h
+++ b/mingw-w64-headers/crt/intrin.h
@@ -99,6 +99,8 @@
 #endif
 #endif
 
+#if (defined(_X86_) || defined(__x86_64))
+
 #if defined(__MMX__) || defined(__MINGW_FORCE_SYS_INTRINS)
 #if defined(__cplusplus)
 extern "C" {
@@ -150,6 +152,8 @@
 #endif
 #endif
 
+#endif
+
 #if (defined(_X86_) && !defined(__x86_64))
 #if defined(__cplusplus)
 extern "C" {